产品描述：土壤水分传感器基于频率反射 FDR 原理，通过 100MHz 频率下测量传感器上电容的变化，从而测量插入介质的介电常数。

产品英文描述：The soil moisture sensor is based on the principle of frequency reflection FDR .The dielectric constant of the inserted medium is measured by measuring the capacitance change on the sensor at a frequency of 100MHz.

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